Auger-bit



(No Model.)

-W. B; EDWARD, Jr..& J. S. HOWARD.

AUGER- BIT.

Patented Sept; 8,1896;

n4: Noam: PETERS 00.. PNO'IO-LIT UNITED STATES P TEN T FFlCE. I

VILLIAM B. HOWARD, JR., AND JOSEPH S. HOWARD, OF BROOKLYN, NEW

YORK.

AUGER-BIT.

SPECIFICATION forming part of Letters Patent No. 567,271, dated September 8, 1896. Application filed August 14:, 1895. Serial No. 559,297. (No model.)

- To all whom, it nuty concern.-

improvement in auger-bits, and has for its object to provide such a device with a removable reaming-bit and an oil-groove,whereby an auger-bit will be rendered more useful in its operations; and with these ends in view it consists in certain details of construction and combination of elements hereinafter set forth and then specifically designated by the claims. 7

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, we will describe its construction and operation in de-' tail, referring by numbers to the accompanying drawings, forming a part of this specification, and in which- Figure 1 is a perspective of an auger-bit having our improvement applied thereto, and Fig. 2 an end view showing the relative position of the reamer lip and cutter.

Similar numbers denote like parts in both views of the drawings.

1 represents the stem,and 2 the shank,made

in the usual form,and formed upon this shank r is the spiral conveyer-groove 3, by which the chips are lifted from the hole, and 4 is the cutter by which said chips are formed and which is formed at the bottom of this groove.

5 is a spiral groove of the same pitch as the groove 3 and formed in the stock between the coils of said groove 3, but of less depth than the latter. This groove 5 gradually decreases in depth at its lower end until it blends with the circumference of the blank 6, for the purpose hereinafter set forth.

7 'is a reaming-cutter the shank of which is dovetailed into the blank 6 and held against displacement by the screw 8, the head of which is flush to avoid obstructing the operations of r the auger when boring a hole.

From this description the operation of our device will be obviously as follows: After a hole has been started and the auger has reached a sufficient depth in the material oil or other lubricant may be supplied to the circumference of the device through the groove 5, and as this groove terminates before reaching the cutting edges of the auger it will be seen that the friction between its circumference and the material in which it is operating will be greatly reduced without interfering with the cutting qualities thereof; and this 7 is of special advantage where holes of great depth are to be bored, in that the'contact surfaces are kept cool and thereby prevented from increasing in diameter and binding within said hole. The object of having the oil-groove decrease in depth at the lower end is to form a cup for the oil which is bounded by the walls of the groove and the hole which is being bored. This feature allows the sides of the hole to be constantly lubricated and avoids the well of oil at the bottom of the hole, as would result with the groove shown in reference. It will be understood that the pocket will allow enough oil to run out at the bottom to keep the operating parts well oiled, but prevents the oil being wasted by being soaked up by the chips. Should the reaming-lip become dulled, it is onlynecessaryto remove the screw, when it may be withdrawn from the blank, sharpened and replaced, and a further advantage is gained in that when the reaming-cutter is removed afree surface is presented upon the bottom of the auger, whereby the cutter 4 may be easily sharpened without injuring the reaming-cutter.

While we have shown the reaming-cutter set approximately opposite the cutter 4, it is obvious that its position might be changed, as well as other slight modifications made in the construction and arrangement of the several parts of our improvement, without departing from the spirit of our invention,which rests in the broad idea of providing an oilgroove whereby a lubricant may be supplied to the contact-surfaces without interfering with the elevating of the chips by the conveyeregroove, and also providing a removable reaming-cutter whereby said cutter and the cutter 4 may be sharpened without danger of being injured.

The starting-bit 9 is provided with threads having a horizontal base and an angular upper side, as clearly shown, in order that it may take a better hold upon the material in which the work is performed, as it is thereby enabled to separate the grain of the material and crowd it in one direction only instead of two directions. It will be seen that as the groove 5 terminates before reaching the bottom of the auger a considerable blank space is left upon the circumference of said auger at its bottom into which the removable reamingbit may be set, so that great strength is attained,which would not be the case were more than one of these reaming-bits used, as it is not possible to provide a sufficient amount of blank space on diametrically opposite sides of an auger.

Having thus fully described our invention, what we claim as new and useful is 1. In an auger-bit, an oil-groove formed in the stock of the bit between the coils of the conveyer said groove gradually diminishing in depth at its lower end, as and for the purpose described.

2. In an auger a groove forming an oilpocket with the side of the hole being bored and said groove terminating before reaching the operating part, as and for the purpose described.

3. In an auger a spiral groove forming an oil-pocket and terminating just before reaching the operating parts, as and for the purpose described.

4. In an auger-bit an oil-groove formed in the stock of the bit between the coils of the conveyer, said groove gradually diminishing in depth at its lower end and terminating just above the working parts, as and for the purpose described.

In testimony whereof we have hereunto affixed our signatures in the presence of two subscribing witnesses.

WM. B. HOWARD, JR. JOS. S. HOWARD. \Vitnesses:

Guo. B. EDwARDs, J ERE J. PowERs. 

